<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>设置盒子居中</title>
    <style>
        /* margin-left:auto;margin-right:auto可以设置盒子居中 */
        div{
            width:100px;
            height: 100px;
            background-color: red;
            /* text-align: center; 设置文本居中 */
            margin-left: auto;
            margin-right: auto;
        }
    </style>
</head>
<body>
    <div>

    </div>
</body>
</html>